The magnetic field strength of an electromagnetic dry powder magnetic
separator is a key parameter that affects the sorting effect and can be adjusted
in the following ways:
1. Adjust the current size
-Principle: The magnetic field strength of an electromagnetic dry powder
magnetic separator is mainly controlled by the magnitude of the current.
According to the law of electromagnetic induction, the magnetic field strength
is proportional to the coil current, so adjusting the supply current can change
the magnetic field strength.
-Operation: Usually, the magnetic field strength of the magnetic separator
can be adjusted by increasing or decreasing the current through a frequency
converter or current regulator on the control panel. Increasing the current can
enhance the magnetic field strength, while decreasing the current can reduce the
magnetic field strength.
-Attention: Increasing the current will increase the energy consumption and
heat generation of the equipment, so it is necessary to pay attention to the
heat dissipation of the equipment during adjustment to avoid overloading and
damage to the equipment.
2. Adjust the number of turns in the coil
-Principle: The magnetic field strength is not only related to the magnitude
of the current, but also directly proportional to the number of turns in the
coil. Increasing the number of turns in the coil can increase the magnetic field
strength, while increasing the number of turns can decrease the magnetic field
strength.
-Operation: Different turns of coils can be considered during the design
phase or equipment modification. In general, the coil turns of a magnetic
separator are fixed after leaving the factory, so the adjustment of turns is
mostly used for customized design before equipment production, rather than daily
operation adjustment.
3. Adjust the excitation voltage
-Principle: The magnetic field strength can also be controlled by adjusting
the excitation voltage, as the current is proportional to the voltage.
Increasing the excitation voltage will increase the current, thereby enhancing
the magnetic field.
-Operation: Set appropriate voltage parameters on the control system of the
magnetic separator, gradually adjust to the appropriate excitation voltage, and
control the magnetic field strength within the optimal range.
-Attention: When adjusting the voltage, it is necessary to ensure that it
does not exceed the rated voltage range of the equipment to prevent overvoltage
damage to the equipment.
4. Change the working air gap of the magnetic separator
-Principle: The magnetic field strength is also related to the working air
gap of the magnetic separator (i.e. the distance between the magnetic pole and
the magnetic medium). The smaller the air gap, the stronger the magnetic field
strength. On the contrary, as the air gap increases, the magnetic field strength
will decrease.
-Operation: In some magnetic separators, the size of the air gap can be
adjusted mechanically, usually during installation and commissioning stages, in
order to set it at the optimal distance.
-Attention: A small air gap may cause increased wear on the magnetic
separation medium and magnetic poles, while a large air gap may affect the
magnetic field effect. Therefore, to find the appropriate air gap distance, it
is usually recommended to complete the adjustment at the factory or during the
first debugging.
5. Adjust the temperature of the cooling system
-Principle: Temperature changes can affect the conductivity of
electromagnetic coils, and high temperatures can increase resistance, thereby
reducing magnetic field strength. Therefore, maintaining the coil temperature
within an appropriate range through a cooling system can ensure stable magnetic
field strength.
-Operation: According to the working environment and temperature requirements
of the equipment, set the appropriate cooling system temperature or turn on the
air cooling system to maintain the normal working temperature of the magnetic
separator and avoid a decrease in magnetic field strength.
-Attention: Regularly check the working condition of the cooling system to
ensure its good operation and prevent temperature rise from causing unstable
magnetic field strength.
6. Use automated control systems
-Principle: Some high-end electromagnetic dry powder magnetic separators are
equipped with automatic control systems, which can automatically adjust
parameters such as current, voltage, and air gap according to the feeding
conditions and sorting requirements to accurately control the magnetic field
strength.
-Operation: By setting up an automatic control program, the magnetic
separator will automatically adjust the magnetic field strength according to
different materials during operation, ensuring the stability and consistency of
the sorting effect.
-Attention: The automation control system needs to be programmed according to
specific production requirements and calibrated regularly to ensure the accuracy
and reliability of the system.
summary
The adjustment of magnetic field strength in electromagnetic dry powder
magnetic separators involves multiple parameters, including current, voltage,
coil turns, air gap size, and cooling system. By adjusting these parameters
reasonably, the magnetic field strength can be adjusted according to specific
sorting needs, ensuring the stability of sorting effects and the efficient
operation of equipment. In daily operation, the main methods used are to adjust
the current and excitation voltage, while in the equipment design and
installation stage, preliminary adjustments can be made by combining factors
such as air gap and coil turns. Meanwhile, the rational utilization of automated
control systems can further improve the accuracy and efficiency of
regulation.